Telephone system employing phonographs



"Marh16,1943. H- R. vm Isa/E R 2'313'852 TELEPHONE SYSTEM EMPIJOYI'NGPHONOGRAPHS Filed Sept. 26, I941 3 SheetsSheet l a "R a UPKS C 0RDMarch16, 1943. H. R. VAN DEV ENTER 2,313,352

TELEPHONE SYSTEM EMPLOYING PHONOGRAPHS Filed Sept. 26, 194] 3 Sheets-Sheet 21 ATTORN EYS illustration,

Patented Mar. 16, 1943 PHONO GRAPH S Harry R. Van Deventer, New York, N.Y., assignor to Peatrophone Corporation, New York, N. I,

a corporation of Nevada Application September 26, 1941, Serial No.412,410

24 Claims.

This invention relates to telephone systems in which phonographs may beassociated with the subscribers lines to deliver and: record messages.

An object of the invention is to provide circults and apparatus bywhichany subscribers line can be connected to a phonograph located at thetelephone central ofllce or exchange, With-r out disturbing the existingline or cord circuits and without substantially changing the operativeprocedure now' in common use.

Another object is to provide means for connecting a phonograph .to anyof the subscribers; lines terminating in an exchange, in

.Jsuch a manner that the phonograph is under the control of the operatormaking the connection between the calling and calledjlines, the latterbeing connected to the phonograph.

A further object is to provide ai system oi the class described in whicha plurality of phono graph circuits may be connected to plugs adapted tobe placed in the subscribers line jacks of the switchboard; or connectedvia the-usual test or terminal plugs as used in the main andintermediate connecting frames in an exchange. In

either event the phonograph circuits can be plugged into any subscribersline without inter-7 fering with the soldered connections on "theterminal racks and other equipment. I

Other objects will be apparent from a perusal of the followingspecification where, by way oi.

telephone exchange circuits are shown of a type in common use. It willbe un derstood, however, that once the inventive concept hereindisclosed is understood, that these circuits and the arrangement of theapparatus can be varied within wide limits without departing from theinvention as defined by the appended claims. I I J And while preferredembodiments of the inventive idea areshown by way of illustration, it

will be further understood that once the result attained by the circuitsand arrangement of apparatus particular to the phonograph circuit andits associated devices as distinguished from the telephone exchangecircuits per se) herein disclosed is understood, that many modificationsand changes will be obviousto those skilled in theart and that thesealso may ibemade without departing from the scope of the appendedclaims.

Referring now to the drawings- Figu e l is a schematic diagram of asubscrib ers line circuit at a telephone exchange together with aschematic diagram of, an operators cord circuit that may be used forconnecting subscribers lines, and atthe right of this figure is shown a:phonograph circuit that may be connected to the subscribers line via aplug in one of the line Jacks, of the line or via connections at themain or'intermediate frames; Figure 21s a schematic diagram of analternate form of phonograph circuit that may be connected to thetelephone line either at the main frame or via a plug in one of the linejacks;

Figure 3 is a schematic diagram t an alternate form ofphonographlcircuit that may be connected to the telephone line either atthe intermediate frame or via a plug in one of. the line jacks; and VFigure 4 is a schematic diagram of an alternate form of phonographcircuit which may be connected to the subscribers line via theintermediate frame. I I

In Figure 1, the numeral I0 denotes the main connecting frame in theexchange on which terminate the incoming line wires I I, I I, of atelephone line connected by the usual jumper wires ill to the multiplejacks I2,-intermediate frame 42, jack I2, line relay I3 and cut-offrelay I4, constituting the usual line terminal equipment. This completeline, circuit will hereafter be termed the sub-set circuit.

Should itbe desiredto connect a phonograph to, the sub-set circuit,conductors I5, I6, are connected to a plug or pair of clips indicated atI! adapted to make contact with the connecting springs or terminals ofthe line wires 1 I, II, in the main frame I0, or to the tip and ringsprings of a jack so that the circuit for the phonograph can be bridgedon the sub-set circuit as shown without disconnecting or changing anyrofthe connections or apparatus in said circuit. The circuit I5, I6, willhereafter be termed the phonograph circuit. I

The phonograph circuit includes a repeating coil having windings I8, I9,20, -2I, a relay 22, signal current condenser '23, by-pass condenser 24,and the phonograph motor 25 and its cam switch 26 connected as shown,the contacts 28 and 29, iii! and 3 I, of relay 22 being normally open.Should the subscriber on the sub-set circuit remove his receiver fromthehook, the apparatus in the sub-set circuit will operate as usual andthe line lamp 2'! will be illuminated. The answering operator answersthe call by pluggin into the answering jack using the operator's cordcircuit marked Oprs Cord and in all respects incomin calls are handledover the sub-set circuit in the Usual manner. none of the apparatus inthe phonograph and could record a message.

'will record any message 7 'cares to leave, the talking circuits of thephonoopaque to ringing currents.

, next actuation of the relay 1 denser 23 is short-circuited, nor

Assuming the line rethere'would normally flow in phonograph circuit l5,l3, operating during an incoming call over the sub-set circuit.

However, should some other subscriber call for the subscriber connectedto the sub-set circuit, the

. calling operator would plug into one of the multiple jacks l2 and ringon the line in the usual 1 manner. If the subscriber answers thetelephone,

the two-way conversation would b .recorded. If a the subscriber does notanswer, then the calling subscriber would receive any message left onthe either event the operation of the phonograph is as follows:

circuit, I 5, [8,

When the operator, rings on the sub-set ringing current will flow in thecircuit ll,

23, winding of relay 22, l9, Hi to I I, thereby oper ating relay 22which closes its contacts 28, 29,

, thereby short-circuiting condenser 23'and establishing a path f ordirect current through the operators cord circuit from the battery 32,through relay 22 which accordingly holds itself locked closed. Theclosing of this circuitalso operates supervisory relay 48 andextinguishes the operators supervisory lamp 48 in the usual manner, so

' the operator knows that the call is completed.

If automatic ringing is used, the holding relay in the cord circuit actsas usual to disconnect the ringing current. V V v d Relay 22 also closescontacts 30, 3|, which close thecircuitirom the battery 32, or any othersuit able current supply for the motor, (such as a source'of A. C.current), through the phonograph motor 25 and its cam switch 26. Thephonograph thereupon delivers any message left thereomand graph beingconnected to the windings 20, 2|, 'of the repeating coil. r

The by-pass condenser 24 affords a path for voice currents across thewinding of relay 22, and this condenser may be ofless capacity than thesignal current condenser 23 so as to be relatively It does not affectthe, operation of the ringing current on the winding of relay 22.

As beforestated, relay 22 is held closed (once it has been operated byringing current) by reason of the cord circuit battery current from 32.Therefore, when the calling subscriber has 'finished-speaking and hangsup his receiver, thereby lighting the'answering supervisory lamp in thethe calling subscriber the operator disconnects both be available tooperaterelay 22. Also at this time.

the line relay|3 is out of circuit, as the cut-oil rela M has operated.

As the phonograph motor 25 is controlled by the relay 22, it iscontrolled bythe withdrawal of the calling operators plug from thesub-set circuit ,7

jack. It is also controlled by the cam switch 26 which is in gearedrelation to the motor 25 to stop the motor by opening the circuit whenthe end of a rec-0rd is reached, or at any other time or in any othersequence relative to the length of elapsed time of the incomin callbeingrecorded.

From the foregoing it will be seen that the normal operation of asubscribers line is not interiered with in any way by having thephonograph connected thereto; nor is the operative procedure changed inany way. Upon receipt of a call for such a line, the operator merelyplugs in and rings in the usual way as it normally calling thesubscriber. Instead of the called subscriberanswering, the relay22operates, extinguishes the calling supervisory lamp and the phonographspeaks to the calling subscriber and he may record a message. When thecalling subscriber hangs up his receiver and the operator removes bothplugs, re-' lay 22 operates to stop the recording and restore thephonograph circuit to position ready to receive another call. I

' In Figure 2, an alternate form of phonograph circuit is shown, therelay 33 having a winding 34 in series with'condenser 23 and thewindings l8, IQ, of the repeating coil across conductors l5, l6. Uponringing current traversing this circuit, relay 33 closes its contactswhereupon a holding circuit is'completed from the current' source 32through winding 35, contacts-36, 31, contacts on cam switch 26 to thecurrentsource at 38, and the relay locks itself in closed position. Atthe same time contacts 39, 40, close and short circuit the condenser 23and winding 34 of relay 33, thus forming'a path for direct currentacross is inserted in the circuit making it opaque to direct current,and the circuit stands ready for the 22 by ringing current.

It will be understood that the resistance and other characteristics ofrelay 22 are such that when its winding is across the sub-set circuit,it will not operate the line relay I3 even when con-- will it remain inclosed contact position. lay l3 to have a total resistance of 2000 ohms,the sub-set and phonograph, circuits about .012 ampere when nooperatorsplugs are connected thereto, and relay 22 is of suchcharacteristics that it will not remain closed on such current, nor willit permit sufficient current to flow through it to close the line relaymore will conductors |5, |6, via the windings l8, IQ, of the repeatingcoil. This eirtingulshes the supervisory light in the calling operatorscord circuit.

With this circuit, Figure 2, the cam switch 26 is arranged to open itscontacts momentarily after a predetermined time-say after 30 seconds ofrecording which is ample for average service This breaks the circuitthrough the holding winding 35 of relay 33, which thereupon opens allits contacts stopping the motor 25 and restoring the phonograph circuitto'condition ready to receive the next call.

In Figure 3, an alternate form of phonograph circuit is shown, and thecircuit requires that connection be made with the tip, ring and sleeveconductor of the sub-set circuit, accordingly the conductors l5, I6, 4|,of the phonograph circuit are connected to a suitable plug which may beconnected to the proper terminals at the intermediate frame 42. or to anordinary plug to fit the line jacks l2. Plug I1 like any of the plugsshown connected to the phonograph circuit, Figures 1 to 3 inclusive, maybe made .to snap on the main or intermediate frame Q terminals. Incomingcalls on the sub-set circuit are handled in the usual manner,-but shoulda calling operator plug into this circuit and ring, the current wouldtraverse conductor |5, condenser 23, winding 43 and conductor H5, andrelay 44 would close contacts 45, 46, thus establishing a holdingcircuit from the cord circuit battery 32 of the calling operator's cordcircuit via supervisory lamp 48, sleeve conductor 49, throughthe sleeveconductor of the line jacks lto conductor 41 'of thephonograph circuit,contact 45, 45, locking winding 50; contacts of cam switch26 to at 38,thereby locking the relay 44.

Contacts 51, 52, on relay 44 being now closed, there is a path fordirectcurrent across conductors l5 16, which extinguishes the super rvisor-y lamp 48 in the usual manner, as the supervisory relay 48operates.

Contacts 53, 54, on relay 44 alsocompletethe circuit through motor 25and current supply'32,

and as the motor operates the phonograph reproduces or recordsviawindings 20, 24. r

Upon withdrawal of the calling operators plug from the line jack, thecircuit from cord circuit battery supply 32 is broken at the sleeve 49and winding 50 of relay 40 is deenergized, the relay opening all itscontacts, thus restoring the phonographlcircuit to condition ready toreceive another call.

If at any time cam switch 26 should operate,

relay 44 would release and contacts 5|, 52. open, thereby lighting thesupervisory lamp 48 and notifying the operator. i

Figure 4 shows an alternate form of phonograph circuitwhich is adaptedto be plugged 'in the sub-set line circuit at the intermediate frameusing a six conductor plug indicated diagram matically at 55; and havingconductors and ter minals'THR, 56 51 SL and I4, so as to connect thephonograph circuit and apparatus between the line and cut-off relay andthe line and jacks of the sub-set line circuit. This results in atransfer circuit by which the functions of the regular line ([3) andcut-off relay (l4) are transferred to other relays H3, 14) associated'with the phonograph and transfer circuits.

, Assuming the line circuit II. II, to be normal, and the phonographcircuit plugged therein as shown, the regular line relay l3 and cutoffrelay H are disconnected from the line, and line relay I3 and cut onrelay M of the phonograph cirrelay l4 which opens its contacts 58, 59.controlling the circuits through the line relay I 3 thereby releasingthe latter, thus opening contacts 5B,

57, and releasin relay [3. thereby extinguishing the line lamp 21.

Contacts 58, 59, now establish a new bridge circuit 63 across I l. I lwhich can be traced from ,1 the tip side of line,';via 5a to the windingso of signal relay 6|, via condenser 62 and via contact 59 to I l thering side of the line. However,

, because of the condenser 62 this circuit isiopaque vto direct currentfiowingfrom battery 32 in the cord circuit and consequently theoperators supervisory lamp 48 is not operated by this circuit but onlyby the'current flowing out over the circuit II. I I, and through thesub-set connected r thereto. Upon ascertaining the desired number,

the operator rings the party wanted in the usual way and has the usualdouble supervision not withstanding UlL' fact that the phonographcirunit as shown is connected to the calling line, as this circuit doesnot become :operative to start ground 7 incoming calls thereon, or toconnect other lines the phonograph 32 unless ringing current is appliedto relay 6!;

Assuming now that the sub-setcircuit II, H is; the called line, theoperator proceeds as just described up to the point where the circuitthrough relay 6| has been completed and then rings on the line ringingcurrent passing through winding Gil and condenser 62, will cause relayBl to close its contacts 64, 55, thereby completing a holding circuitfrom thebattery 32 via contacts 66, 61 (which are on cut off relay i4?and closed because that relay is energized by a plug being up on theline) via winding '58 on relay 6i to ground at 38. This looks relay 5iwhich also closes contacts 69, in, completing a circuitfrom line H viacontact 58 to winding 18 of the repeat ing coil, via contact" 59 to linel I. As this affords a path for the cord circuit battery 32, thesupervisory lamp 48 is extinguished;

Motor 32 gets power via contact 66 on relay M, the circuit beingcompleted at contact 65, relay 6 l. The motor, therefore, cannot startuntil relay 6! has operated, and will stop when the operator withdrawsthe plug, thereby releasing relay H.

The cam, switch 26 operates in any desired manner, either to limit thelength of each recordingor to open the motor circuit permanently when agiven recording space is used on the phonograph record. 4

, It will be observed that the operators in testing a line to which" anyof the circuits hereindisclosed are connected will receive the usualbusy signal ifsaid line is in useeither by the subscriber or by reasonof the phonograph connected thereto being in operation; also,thatstandard operative procedure is used throughout-it not beingnecessary for any operator to even know a line is phonograph equipped inorder to alliswer thereto, and that no special cord or line equipment isnecessary at all operators positions, all the special phonograph circuitequipment being local to the plugs for use on the main or intermediateframe, or in line jacks, a sufiicient number of such circuits beingprovided for each ex change. These circuits can be plugged onto lines asdesired and removed, moved and replaced without interfering with theroutine work of the operators and without access to the regularoperating equipment other than the terminal racks and line jacks.

As the phonograph equipment per se forms no part of the presentinvention, it is not described in detail as it is obviousthat anysuitable mechanism may. be employed and the recording and reproducingcircuits by appropriately controlled mechanism connected to the windings20, 2!, of v the repeating coil so as who inductively coupled to thesub-set circuit, A suitable mechanism is 333,268. filed shown inco-pending application Serial Number May 4, 1940, entitled Telephoneanswering and recording apparatus. which also shows the construction andoperationofthecarn r .swittzh 26 herein referred to.

Obviously the talking circuits of the phono-, graph could beconnecteddirectly across the. phonograph circuit l5, IS, withoutemploying the,

repeating coil; or the talking circuits could be connectedthrouglrcondensers or in-any other suitable manner. The coil ispreferable however,

The feature of connecting the talking and control circuits of thephonograph to the telephone lines via the connections at the main orinter.

equipment commonly used for testing and bridging connections inexchanges, and therefore no special equipment is necessary except thatlocal to the phonograph circuits connected to the plugs. T

The phonograph may be placed in a room or department of the exchange setapart'for that purpose and wired to numbered plugs conveniently locatednear the frames. Upon an operator receiving a request fOr phonographservice, this operator merely refers the call to the recording operator,who orders the attendant to plug up the line at the frame. When this isdone, the regular operation of the switchboard continues as before.

Should any messages be recorded, upon request from the subscriber, therecording operator can have them played back while the subscriberlistens. records, they can be mailed him.

Should the phonograph circuits Figures 1 to 3, inclusive, be connectedto the telephone lines "via connecting plugs fitting the line jacks ofthese lines, the operation of the circuits wouldv be the same as justdescribed. These connecting plugs are conveniently grouped within reachof one or more operators, who, at the request of the subscribers orother operators, plug these plugs into the designated lines. This, itwill be observed, does not affect the routine operation of the otheroperators in the exchange when handling incoming and outgoing calls tothe lines so plu ged up.

What is claimed is:

1. In combination with a telephone line circuit having line terminalequipment and including operators cord circuits for connecting said linecircuit to other line circuits, means connected to said line circuitopaque to direct current and responsive to ringing current forestabllshing a direct current path across'said line circuit, and aphonograph including a circuit which is completed by the establishmentof said direct current path, whereby the operation of said phonograph iscontrolled by ringing current in said first path.

2. In combination with a line circuit having exchange signallingequipment and a jack connected thereto, a phonograph circuit havingmeans normally opaque to direct current and responsive to alternatingcurrent including a relay and contacts operated thereby for establish-'cuit having line terminal equipment located at a central office providedwith operator's cord circuits for connecting the line circuit to otherline circuits, a relay circuit bridged across said line circuit andhaving a relay and a condenser in series with the winding thereof torender If he wants the phonograph said relay circuit normally opaque todirect current, contacts controlled by said relay and adapted when sameis energized to short-circuit said condenser, thereby placing theaforesaid winding directly across said line circuit so that directcurrent may flow therethrough, a cord circuit connected to said linecircuit and adapted to supply direct current to said rela winding tohold said relay closed while said cord circuit is connected thereto, anda phonograph and means for operating the same, controlled by contacts onsaid relay.

4. In combination with a telephone line circuit having line terminalequipment located at a central office provided with op'erators cordcircuits for connecting the line circuit to other line circuits, a relaycircuit bridged across said line circuit and having a relay and acondenser in series with the winding thereof to render said relaycircuit normally opaque to direct current, contacts controlled by saidrelay and adapted when same is energized to short-circuit saidcondenser, thereby placing the aforesaid winding directly across saidline circuit so that direct current may flow therethrough, a cordcircuit connected to said line circuit and adapted to supply directcurrent to said relay winding to hold said relay closed While said cordcircuit is connected thereto, a phonograph and means for operating thesame, controlled by contacts on said relay, and a bypass condenserconnected across the winding of said relay.

5. In combination with a telephone line circuit having line terminalequipment located at a central office provided with operators cordcircuits for connecting the line circuit to other line circuits, a relaycircuit bridged across said line circuit and having a relay and acondenser in series with the winding thereof to render said relaycircuit normally opaque to direct current, contacts controlled by saidrelay and adapted whensame is energized to short-circuit said condenser,thereby placing the aforesaid gra h.

7 6. In combination with a telephone line circuit having line terminalequipment located at a central ofiice provided with operators cordcircuits for connecting the line circuit to other line circuits, a relaycircuit bridged across said line circuit and having a relay and acondenser in series with the winding thereof to render said relaycircuit normally opaque to direct current, contacts controlled by saidrelay and adapted when same is energized to short-circuit saidcondenser, a relay winding, a holding circuit including another windingon said relay, contacts operated thereby and a source of current. and aphonograph controlled by the operation of said relay.

'7. In combination with a telephone line circuit having line terminalequipment located at a central olilce provided with operators cordCir-J:

cults for connecting the line circuit to other line circuits, a relaycircuit bridged across said line circuit and having a relay and acondenser 1n series with the winding thereof to render said relaycircuitnormally opaque to direct current,

contacts controlled by said relay and adapted when same is energized toshort-circuit said condenser, a relay winding, a holding circuit including another winding on said relay, contacts operated thereby and asource of current, a phonograph controlled by the operation of saidrelay, and a repeating coil winding serially included in circuit withsaid first, relay winding,

said coil having a second winding connected to i the talking circuits ofsaidphonograph.

8. In combination with a telephone line circuit having line terminalequipment located at a central oifice provided with operator's cordcircuits for connecting the linecircuit to other line circuits, a relaycircuit bridged across said line circuit and having a relay and acondenser in series with the winding thereof, a holding includingcontacts on said second cut-oil relay,

circuit including another winding on said relay and contacts and asource of'current, and a phonograph controlled by the operation of saidrelay. i

9. In combination with a telephone line circuityhaving line terminalequipment located at a central officeprovided with operators cordcircuits for connecting the line circuit to other line circuits, a relaycircuit bridged across said ,line circuit and having a relay and acondenser in series with the winding thereof, a holding circuitincluding another winding on said relay and contacts and a source ofcurrent, a phonograph controlled by the operationof said relay, and arepeating coil circuit including the winding of a repeating coil bridgedacross said phonograph circuit and controlled by the operation of saidrelay, said repeating coil having a second wind ing connected to thetalking circuits of said phonograph.

10. In combination with a telephone line having line and cut-off relaysconnected thereto, a

transfer circuit having a second line relay and a second cut-oif relaytherein connected to said line circuit, said second line relay havingcontacts connected to said first linerelaytooperate the latter toenergize the line lampassociated therewith. a cord circuit adapted to beconnected to said telephone line circuit and when so connected to causeboth said cut-oft relays to operate and disconnect both said line relaysfrom said telephone line, a circuit controlled by said second cut-01frelay and containing signal responsive means, and a phonographcontrolled by said means.

11. In combination with a telephone line havj circuit and in seriesingline and cut-off relays connected thereto, a

transfer circuit having a second line relay and a second cut-ofi relaytherein connected to said: line circuit, said second line relay havingcontacts connected to said first line relay to operate the latter toenergize the line lamp associated therewith, a cord circuit adapted tobe connected to said telephone line circuit and when so connected tocause both said cut-off relaysto operate anddisconnect both said linerelays from said telephone line, means operated by said second cut-offrelay for connecting a bridge circuit to said telephone line, a signalrelay having a winding and a condenser in series therewith in saidbridge circuit, a holding circuit serially including contacts on saidsecond cut-oil relay, a source of current, a second winding onphonograph controlled by said signal relay.

12. In combination with a telephone line having line and cut-ofi relaysconnected thereto, a transfer circuit having a second line relay and asecond cut-off relay therein connected to said line circuit, said:second line relay having contacts connected to said first line relay tooperate the latter to energize the line lamp associated therewith, acord circuit adapted to be connected to said telephone line circuitfandwhen so connected to cause both said cut-off relays to operate anddisconnect both said line relays from said telephone line, meansoperated by said second cut-off relay for connecting a bridge circuit tosaid telephone line, a signal relay having a winding and a condenser inseries therewith in said bridge circuit, a holding circuit, serially asource of current, a second winding onsaid signal relay and contactsthereon, a phonograph controlled by said signal relay, and a repeatingcoil having a winding connectedto said bridge with contacts controlledby said signal relay, said repeating coil having a second windingconnected to the talking circuits of the phonograph. 7 p

13. In a telephone exchange system having a frame in which telephoneline circuits are con nected to switchboard apparatus, means forconnecting phonograph control and talkingcircuits to said telephonelinecircuits in said frame including a detachable graph circuit can beconnected to any one of said telephone line circuits while same remainconnected to said switchboard apparatus.

14. In a telephone exchange system having a frame in which telephoneline circuits are ,connected to switchboard apparatus, and means forconnecting phonograph control and talking circuits to said telephoneline circuits in said frame including a detachable plug whereby some ofsaid phonograph circuits are connected to the outgoing telephone linewhile other of said phono- J graph circuits are connectedto theswitchboard.

15. In a'telephone exchange system having a switchboard in which aplurality of telephone circuits terminate for interconnection via jackson on said switchboard, connecting cord circuitsfor i connecting saidlines for telephonic communica tion phonograph control and talkingcircuits, and a plurality of connecting plugs adapted to fit said jacks,each of said plugs being connected to one of said phonograph control andtalking circuits whereby said circuits can be connected to any of thetelephone circuits via the jacks connected to same, while permitting theinterconnection of any telephone circuit so connected to s a phonographcircuit, with any other telephone circuit via one of said connectingcordcircuits. 17. In a telephone system, telephone line circuits, meansfor connecting said circuits includ ing a cord circuit havingsupervisory means said signal relay and contacts thereon, and a plugwhereby said pheno therein, a phonograph 'circuitand means independentof said cord circuit for connecting same to any of said telephone lines,and means in said phonograph circuit for controlling said supervisorymeans.

18. In a telephone system, a called and a calling telephone linecircuit, a cord circuit connecting said lines and having answering andcalling supervisory signals, a phonograph circuit including a phonographhaving a talking circuit connected independently of said cord circuit tothe calledcircuit, and means in said phonograph circuit for controllingsaid calling supervisory signal and holding same in non-displayedposition until the connection between said called and calling lines isbroken by the disconnection of the cord circuit from the called line.

19. In .a telephone system, a called and a calling telephone linecircuit, a cord circuit connecting said lines and having answering andcalling supervisory signals, a phonograph circuit including a phonographhaving a talking circuit connected independently of said cord circuit tothe called circuit, and means in said phonograph circuit for controllingsaid calling supervisory signal and holding same in non-displayedposition until the completion of a predetermined period of operation ofsaid phonograph.

20. The combination as claimed in claim 18 wherein the phonographmechanism has a switch controlling the supervisory signal in the calledline side of the cord circuit.

21. In a telephone system,

a telephone line, a

phonograph circuit connected thereto including a phonographand means foroperating the same, a cord circuit for connecting said line to otherlines, means in said cord circuit for starting the operation of saidphonograph, and means in said phonograph circuit operable by currentsupplied via said cord circuit whereby upon the disconnection of saidcord circuit from said telephone line the operation of said phonographwill be stopped.

22. The combination as claimed in claim 21 wherein the phonographmechanism has a switch controlling the connection of the phonographcircuit to the telephone line.

23. In a telephone system, a telephone line, cord circuits havingringing keys for connecting ringing current to said line and means forsupplying operating current thereto for the operation of a telephone, aphonograph circuit connected to said line including a phonograph andmeans for operating the same, means in said phonograph circuitresponsive to said ringing current for starting said phonograph, andmeans in said phonograph circuit responsive to the disconnection of saidoperating current for stopping said phonograph.

24-. The combination as claimed in claim 23 including a repeating coilhaving windings connected to and disconnected from said telephone lineby the sequential operation of both said means.

HARRY R. VAN DEVENTER.

